Patent GB-899831-A (GB)
Title: Improvements in locks for vehicle doors
Inventor: ROBERTSON ROBERT
IPC: E05B65/32
Filed: 1959-06-06
Abstract: 899,831. Latch fastenings. HALLAM, SLEIGH & CHESTON Ltd. May 16, 1960 [June 6, 1959], No. 19426/59. Class 44. In a vehicle door locker in which actuation of a press button from outside the door on the end 8a, Fig. 1, of a lever 8 depresses a slide 5 such that an abutment 18 thereon, engages, through an abutment on an intermediate member 6, a pivoted detent 4 to move a pivoted latch 2 into its release position, Fig. 3, from a strike element 3, the member 6 is movable from its operative position of Fig. 1 to an inoperative position, Fig. 4, in which the door remains locked, depression of the push button and hence the abutment 18 being possible but ineffective. Movement of the member 6 is governed by a lever 7 a pin 20 on the lever interengaging a slot 21 in the member. The outer end 7b of the lever is operable by actuation of a rotary barrel type lock whilst the inner end 7a is moved through an arm 26, Fig. 11, of a lever 23 by a pushpull rod (not shown) operable from inside the vehicle. The lever 23 is held in positions corresponding to the operative and inoperative settings of the member 6 by spring means 29 &c. The door may be unfastened from inside the vehicle by a handle (not shown) connected to an arm 11, Fig. 10, of a lever 12 carrying a part 15a, Fig. 1, which is engageable with the detent 4 to turn the latter to release the latch 2 on operation of the handle. The lever 23 has a notch 32 which, when the lever, with the door closed, is in the position corresponding to the inoperative position of member 6, interlocks with a safety lug 33 on the lever 12 to prevent the handle from being turned to open the door. The lug 33 and notch 32 become disengaged when the member 6 is moved into its operative position. The detent 4 pivotally carries an arm 37 having a pin 38 which is engageable with the lever 7 and is received by a slot 39 in the slide 5. The lever 7 has a stepped lower edge portion 7c, Fig. 5, and wider part 7d such that if the door is moved into the closed position with the member 6 in its inoperative position and the push-button and slide 5 are not pressed in beyond a predetermined position, the arm 37 is moved up by the detent 4 as it is turned by the latch 2 during the latching of the door, and this upward movement of the arm 37  causes the pin 38 to press against the lever part 7d to lift the lever 7 to move the member 6 into its operative position. If, on the other hand, the door is moved into a closed position with the member 6 in its inoperative position but with the push-button and the slide pressed in beyond the predetermined position, the inward movement of the slide 5 will have caused the pin 38 to move with the slide 5 to turn the arm 37, Fig. 6, into a position in which the pin 38 lies spaced beneath the narrower part of the lever portion 7c whereby when the arm 37 is moved by the detent as the door latches, the pin 38 on the arm 37 moves up towards, but does not cooperate with, the lever 7. The closed door is locked from inside the vehicle by actuation of the push-pull rod linked to the arm 26. The door can then only be opened from the outside by using the key associated with the pushbutton. To lock the door from the outside without using the key it is only necessary to move the member 6 into its inoperative position by the push-pull rod and then keep the push-button and slide sufficiently pressed in as the door is being closed. The button can then be actuated, but ineffectively. If the door should be closed with the member 6 in its inoperative position and with the push-button and slide only slightly depressed, the operation of latching the door will automatically cause the member to be returned to its operative position. In the above arrangement the slide is free to move inwards both when the door is in a closed position and when the door is open, but in a modification shown in Figs. 12 to 15 (not shown) the slide is free to move inwards only when the door is in a closed position, means being provided for positively preventing inward movement of the slide when the door is open.